Year	Percent
1950	13.16954
1955	16.29181
1960	17.33083
1965	18.49898
1970	19.80849
1975	20.59451
1980	20.36563
1985	20.08904
1990	19.15302
1995	16.30122
2000	16.64527
2005	16.68127
2010	16.75562
2015	14.75627
2020	13.21995
2025	12.31147
2030	11.71115
2035	11.14924
2040	10.47915
2045	9.73475
2050	8.98692
2055	8.33939
2060	7.81294
2065	7.35841
2070	6.94862
2075	6.5496
2080	6.17892
2085	5.85479
2090	5.58617
2095	5.3784
2100	5.20524