Year	% of total population
1960	40.639
1961	40.144
1962	39.645
1963	39.147
1964	38.65
1965	38.157
1966	37.666
1967	37.178
1968	36.691
1969	36.208
1970	35.727999999999994
1971	35.25
1972	34.961
1973	34.759
1974	34.55800000000001
1975	34.357
1976	34.156000000000006
1977	33.956
1978	33.757000000000005
1979	33.55800000000001
1980	33.36
1981	33.163
1982	33.114000000000004
1983	33.134
1984	33.153999999999996
1985	33.17400000000001
1986	33.194
1987	33.214
1988	33.233999999999995
1989	33.254000000000005
1990	33.274
1991	33.294
1992	33.257999999999996
1993	33.19799999999999
1994	33.138000000000005
1995	33.078
1996	33.018
1997	32.958
1998	32.897999999999996
1999	32.837999999999994
2000	32.778000000000006
2001	32.718
2002	32.617999999999995
2003	32.498999999999995
2004	32.379999999999995
2005	32.262
2006	32.144000000000005
2007	32.025999999999996
2008	31.908
2009	31.790999999999997
2010	31.673000000000002
2011	31.555999999999997
2012	31.316000000000003
2013	31.021
2014	30.727999999999994
2015	30.435000000000002
2016	30.144999999999996
2017	29.855999999999995
2018	29.561999999999998
2019	29.263999999999996
2020	28.961
2021	28.653999999999996
2022	28.343000000000004
2023	28.027