Year	Percent
1950	15.55661
1955	16.86375
1960	16.0438
1965	15.81186
1970	16.1145
1975	16.82116
1980	18.93902
1985	19.67584
1990	18.90025
1995	18.15403
2000	17.58296
2005	16.93863
2010	16.84743
2015	16.46703
2020	15.51937
2025	14.50709
2030	13.60615
2035	12.94877
2040	12.4109
2045	11.85811
2050	11.29137
2055	10.70378
2060	10.17481
2065	9.73521
2070	9.33583
2075	8.96782
2080	8.58109
2085	8.20028
2090	7.84516
2095	7.53893
2100	7.26982