Frequency of wars involving the great powers

number per quarter century, 1513–1988

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Data Item	1513	1514	1515	1516	1517	1518	1519	1520	1521	1522	1523	1524	1525	1526	1527	1528	1529	1530	1531	1532	1533	1534	1535	1536	1537	1538	1539	1540	1541	1542	1543	1544	1545	1546	1547	1548	1549	1550	1551	1552	1553	1554	1555	1556	1557	1558	1559	1560	1561	1562	1563	1564	1565	1566	1567	1568	1569	1570	1571	1572	1573	1574	1575	1576	1577	1578	1579	1580	1581	1582	1583	1584	1585	1586	1587	1588	1589	1590	1591	1592	1593	1594	1595	1596	1597	1598	1599	1600	1601	1602	1603	1604	1605	1606	1607	1608	1609	1610	1611	1612	1613	1614	1615	1616	1617	1618	1619	1620	1621	1622	1623	1624	1625	1626	1627	1628	1629	1630	1631	1632	1633	1634	1635	1636	1637	1638	1639	1640	1641	1642	1643	1644	1645	1646	1647	1648	1649	1650	1651	1652	1653	1654	1655	1656	1657	1658	1659	1660	1661	1662	1663	1664	1665	1666	1667	1668	1669	1670	1671	1672	1673	1674	1675	1676	1677	1678	1679	1680	1681	1682	1683	1684	1685	1686	1687	1688	1689	1690	1691	1692	1693	1694	1695	1696	1697	1698	1699	1700	1701	1702	1703	1704	1705	1706	1707	1708	1709	1710	1711	1712	1713	1714	1715	1716	1717	1718	1719	1720	1721	1722	1723	1724	1725	1726	1727	1728	1729	1730	1731	1732	1733	1734	1735	1736	1737	1738	1739	1740	1741	1742	1743	1744	1745	1746	1747	1748	1749	1750	1751	1752	1753	1754	1755	1756	1757	1758	1759	1760	1761	1762	1763	1764	1765	1766	1767	1768	1769	1770	1771	1772	1773	1774	1775	1776	1777	1778	1779	1780	1781	1782	1783	1784	1785	1786	1787	1788	1789	1790	1791	1792	1793	1794	1795	1796	1797	1798	1799	1800	1801	1802	1803	1804	1805	1806	1807	1808	1809	1810	1811	1812	1813	1814	1815	1816	1817	1818	1819	1820	1821	1822	1823	1824	1825	1826	1827	1828	1829	1830	1831	1832	1833	1834	1835	1836	1837	1838	1839	1840	1841	1842	1843	1844	1845	1846	1847	1848	1849	1850	1851	1852	1853	1854	1855	1856	1857	1858	1859	1860	1861	1862	1863	1864	1865	1866	1867	1868	1869	1870	1871	1872	1873	1874	1875	1876	1877	1878	1879	1880	1881	1882	1883	1884	1885	1886	1887	1888	1889	1890	1891	1892	1893	1894	1895	1896	1897	1898	1899	1900	1901	1902	1903	1904	1905	1906	1907	1908	1909	1910	1911	1912	1913	1914	1915	1916	1917	1918	1919	1920	1921	1922	1923	1924	1925	1926	1927	1928	1929	1930	1931	1932	1933	1934	1935	1936	1937	1938	1939	1940	1941	1942	1943	1944	1945	1946	1947	1948	1949	1950	1951	1952	1953	1954	1955	1956	1957	1958	1959	1960	1961	1962	1963	1964	1965	1966	1967	1968	1969	1970	1971	1972	1973	1974	1975	1976	1977	1978	1979	1980	1981	1982	1983	1984	1985	1986	1987	1988
Frequency of wars involving the great powers	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.98	8.90	8.81	8.73	8.65	8.57	8.49	8.41	8.32	8.24	8.16	8.08	8.00	7.91	7.83	7.75	7.67	7.59	7.51	7.42	7.34	7.26	7.18	7.10	7.02	6.93	6.98	7.02	7.06	7.10	7.15	7.19	7.23	7.27	7.32	7.36	7.40	7.45	7.49	7.53	7.57	7.62	7.66	7.70	7.74	7.79	7.83	7.87	7.91	7.96	8.00	7.92	7.84	7.75	7.67	7.59	7.51	7.43	7.35	7.26	7.18	7.10	7.02	6.94	6.86	6.77	6.69	6.61	6.53	6.45	6.36	6.28	6.20	6.12	6.04	5.96	6.16	6.36	6.56	6.77	6.97	7.17	7.37	7.58	7.78	7.98	8.18	8.39	8.59	8.79	9.00	9.20	9.40	9.60	9.81	10.01	10.21	10.41	10.62	10.82	11.02	10.74	10.46	10.18	9.90	9.62	9.34	9.06	8.78	8.49	8.21	7.93	7.65	7.37	7.09	6.81	6.53	6.25	5.97	5.69	5.40	5.12	4.84	4.56	4.28	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.04	4.08	4.12	4.16	4.20	4.23	4.27	4.31	4.35	4.39	4.43	4.47	4.51	4.55	4.59	4.63	4.66	4.70	4.74	4.78	4.82	4.86	4.90	4.94	4.98	4.90	4.81	4.73	4.65	4.57	4.49	4.41	4.32	4.24	4.16	4.08	4.00	3.91	3.83	3.75	3.67	3.59	3.51	3.42	3.34	3.26	3.18	3.10	3.02	2.93	3.02	3.10	3.18	3.26	3.34	3.42	3.51	3.59	3.67	3.75	3.83	3.91	4.00	4.08	4.16	4.24	4.32	4.41	4.49	4.57	4.65	4.73	4.81	4.90	4.98	5.02	5.06	5.10	5.13	5.17	5.21	5.25	5.29	5.33	5.37	5.41	5.45	5.49	5.53	5.56	5.60	5.64	5.68	5.72	5.76	5.80	5.84	5.88	5.92	5.96	5.92	5.88	5.84	5.80	5.76	5.72	5.68	5.64	5.60	5.56	5.53	5.49	5.45	5.41	5.37	5.33	5.29	5.25	5.21	5.17	5.13	5.10	5.06	5.02	4.98	5.06	5.14	5.22	5.30	5.39	5.47	5.55	5.63	5.71	5.80	5.88	5.96	6.04	6.12	6.20	6.29	6.37	6.45	6.53	6.61	6.70	6.78	6.86	6.94	7.02	6.82	6.62	6.41	6.21	6.01	5.81	5.60	5.40	5.20	5.00	4.79	4.59	4.39	4.18	3.98	3.78	3.58	3.37	3.17	2.97	2.77	2.56	2.36	2.16	1.96	2.04	2.12	2.20	2.28	2.36	2.45	2.53	2.61	2.69	2.77	2.86	2.94	3.02	3.10	3.18	3.26	3.35	3.43	3.51	3.59	3.67	3.75	3.84	3.92	4.00	4.08	4.16	4.23	4.31	4.39	4.47	4.55	4.63	4.70	4.78	4.86	4.94	5.02	5.10	5.17	5.25	5.33	5.41	5.49	5.56	5.64	5.72	5.80	5.88	5.96	5.92	5.88	5.84	5.80	5.76	5.72	5.68	5.64	5.60	5.56	5.53	5.49	5.45	5.41	5.37	5.33	5.29	5.25	5.21	5.17	5.13	5.10	5.06	5.02	4.98	4.94	4.90	4.86	4.82	4.78	4.74	4.70	4.66	4.63	4.59	4.55	4.51	4.47	4.43	4.39	4.35	4.31	4.27	4.23	4.20	4.16	4.12	4.08	4.04	4.00

Frequency of wars involving the great powers, number per quarter century.

Source: Steven Pinker, The Better Angels of Our Nature (New York: Penguin Group, 2011). Pg. 225.