Year	Percent
1950	15.11318
1955	14.78164
1960	17.15236
1965	16.81594
1970	17.61874
1975	16.44919
1980	15.01572
1985	13.73516
1990	12.85276
1995	13.05929
2000	13.96786
2005	13.01666
2010	12.57626
2015	12.94962
2020	11.82156
2025	10.68794
2030	10.2849
2035	10.11737
2040	10.14608
2045	9.93132
2050	9.38526
2055	8.67759
2060	8.10635
2065	7.82719
2070	7.68073
2075	7.46351
2080	7.06841
2085	6.5909
2090	6.16079
2095	5.89225
2100	5.73276