| 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 |
