Year per 1,000 people 1961 1.1 1966 1.1 1971 1.1 1973 1.2 1976 1.3 1977 1.4 1978 1.4 1979 1.5 1980 1.6 1981 1.6 1982 1.6 1983 1.7 1984 1.7 1985 1.7 1986 1.8 1987 1.8 1988 1.9 1989 1.9 1990 1.866 1991 1.889 1992 1.903 1993 1.923 1994 1.983 1995 2.05 1996 2.048 1997 2.178 1998 2.229 1999 2.248 2000 2.235 2001 2.183 2002 2.126 2003 2.179 2004 2.192 2005 2.107 2006 2.274 2007 2.299 2008 2.464 2009 2.581 2010 2.626 2011 2.655 2012 2.714 2013 2.824 2014 2.894 2015 3.046 2016 3.147 2017 3.299 2018 3.353 2019 3.39 2020 3.448 2021 3.516