Year per 1,000 female adults 1960 275.279 1961 274.481 1962 273.913 1963 277.293 1964 275.373 1965 276.162 1966 274.391 1967 272.861 1968 268.225 1969 266.668 1970 263.469 1971 260.892 1972 256.543 1973 251.914 1974 255.517 1975 244.807 1976 237.529 1977 233.973 1978 227.976 1979 221.981 1980 214.232 1981 207.494 1982 204.783 1983 202.155 1984 198.806 1985 197.281 1986 195.512 1987 201.269 1988 205.815 1989 219.018 1990 226.38 1991 240.419 1992 252.535 1993 265.055 1994 258.105 1995 288.339 1996 326.814 1997 373.21 1998 425.736 1999 481.303 2000 531.779 2001 580.334 2002 610.192 2003 636.817 2004 655.977 2005 666.684 2006 668.745 2007 662.894 2008 655.142 2009 667.756 2010 622.399 2011 599.09 2012 571.616 2013 540.148 2014 510.115 2015 482.662 2016 458.338 2017 436.911 2018 419.449 2019 406.656 2020 393.666 2021 432.957 2022 430.905