Year | Amount | 1937-50 | $3,000 | 1951-54 | 3,600 | 1955-58 | 4,200 | 1959-65 | 4,800 | 1966-67 | 6,600 | 1968-71 | 7,800 | 1972 | 9,000 | 1973 | 10,800 | 1974 | 13,200 | 1975 | 14,100 | 1976 | 15,300 | 1977 | 16,500 | 1978 | 17,700 | 1979 | 22,900 | 1980 | 25,900 | 1981 | 29,700 | 1982 | 32,400 | 1983 | 35,700 | 1984 | 37,800 | 1985 | 39,600 |
| Year | Amount | 1986 | $42,000 | 1987 | 43,800 | 1988 | 45,000 | 1989 | 48,000 | 1990 | 51,300 | 1991 | 53,400 | 1992 | 55,500 | 1993 | 57,600 | 1994 | 60,600 | 1995 | 61,200 | 1996 | 62,700 | 1997 | 65,400 | 1998 | 68,400 | 1999 | 72,600 | 2000 | 76,200 | 2001 | 80,400 | 2002 | 84,900 | 2003 | 87,000 | 2004 | 87,900 | 2005 | 90,000 |
| Year | Amount | 2006 | $94,200 | 2007 | 97,500 | 2008 | 102,000 | 2009 | 106,800 | 2010 | 106,800 | 2011 | 106,800 | 2012 | 110,100 | 2013 | 113,700 | 2014 | 117,000 | 2015 | 118,500 | 2016 | 118,500 | 2017 | 127,200 | 2018 | 128,400 | 2019 | 132,900 | 2020 | 137,700 | 2021 | 142,800 | 2022 | 147,000 | 2023 | 160,200 | 2024 | 168,600 |
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