| Data Item | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Minnesota | 1,100.00 | 1,133.75 | 1,167.50 | 1,201.25 | 1,235.00 | 1,274.00 | 1,313.00 | 1,352.00 | 1,391.00 | 1,430.00 | 1,469.00 | 1,508.00 | 1,547.00 | 1,586.00 | 1,625.00 | 1,716.11 | 1,807.22 | 1,898.33 | 1,989.44 | 2,080.56 | 2,171.67 | 2,262.78 | 2,353.89 | 2,445.00 | 2,540.83 | 2,636.67 | 2,732.50 | 2,828.33 | 2,924.17 | 3,020.00 | 2,995.25 | 2,970.50 | 2,945.75 | 2,921.00 | 2,779.00 | 2,637.00 | 2,495.00 | 2,353.00 | 2,211.00 | 2,423.00 | 2,221.00 | 2,278.00 | 2,856.00 | 2,655.00 |
| Wisconsin | 25.00 | 21.00 | 27.00 | 19.00 | 17.00 | 15.00 | 16.00 | 18.00 | 28.00 | 31.00 | 34.00 | 40.00 | 45.00 | 40.00 | 57.00 | 83.00 | 99.00 | 148.00 | 178.00 | 205.00 | 248.00 | 257.00 | ||||||||||||||||||||||
| Michigan | 3.00 | 10.00 | 17.00 | 21.00 | 30.00 | 57.00 | 80.00 | 116.00 | 113.00 | 139.00 | 169.00 | 216.00 | 249.00 | 278.00 | 321.00 | 360.00 | 405.00 | 434.00 | 509.00 | 520.00 | 577.00 | 557.00 | 687.00 | 687.00 | 658.00 | 636.00 | 627.00 | 618.00 | 640.00 | 662.00 |
The counts are conducted during mid- to late winter to present the annual minimum population size.
Source: U.S. Fish and Wildlife Service