Year	Percent
1950	15.69463
1955	17.14095
1960	17.05182
1965	16.96281
1970	16.89148
1975	16.91823
1980	16.807
1985	16.20592
1990	15.19896
1995	14.81372
2000	14.91837
2005	14.33911
2010	13.60267
2015	12.71678
2020	12.08109
2025	11.55417
2030	11.05408
2035	10.55833
2040	10.06038
2045	9.58904
2050	9.14465
2055	8.75891
2060	8.39993
2065	8.05626
2070	7.73024
2075	7.40908
2080	7.11595
2085	6.84699
2090	6.60138
2095	6.38325
2100	6.18167