Year % of total population 1960 5.1971004409933 1961 5.15015784341272 1962 5.1019856571408 1963 5.05197549272484 1964 4.99719579577085 1965 4.93763760150097 1966 4.87435202658556 1967 4.80909544903267 1968 4.74479464805304 1969 4.67733639437221 1970 4.60507012036409 1971 4.54125080341015 1972 4.4917180264735 1973 4.44857498980877 1974 4.40238368521313 1975 4.35339783203859 1976 4.29729039364202 1977 4.2439116063631 1978 4.20336217287852 1979 4.15496942593776 1980 4.1122656486442 1981 4.08772520626368 1982 4.06630751153635 1983 4.01165276886893 1984 3.92561896900651 1985 3.84151868893358 1986 3.76439020276861 1987 3.69627431172532 1988 3.63438152027461 1989 3.57645017667608 1990 3.52229303467519 1991 3.4707151616759 1992 3.42166756925765 1993 3.37510283794278 1994 3.33060489785034 1995 3.28948952322866 1996 3.25212462644167 1997 3.21837277275955 1998 3.18626594720946 1999 3.15436656572958 2000 3.13411983176078 2001 3.1305329497039 2002 3.13817976158824 2003 3.15570464529348 2004 3.18180443029933 2005 3.2163348758249 2006 3.2584415476838 2007 3.30522984208188 2008 3.35120151682737 2009 3.38966892341183 2010 3.41445075007458 2011 3.36339364033172 2012 3.25329633711464 2013 3.15991674846315 2014 3.0978633907332 2015 3.07177649440635 2016 3.07435737331447 2017 3.09700047011982 2018 3.12843791473422 2019 3.15856642866962 2020 3.16653911206332 2021 3.14797100336471 2022 3.12473879162318 2023 3.11806080639936