Year	Percent
1950	7.38929
1955	6.86012
1960	6.06849
1965	5.65593
1970	5.4194
1975	5.23541
1980	3.6774
1985	3.68077
1990	4.00769
1995	4.35114
2000	3.9698
2005	5.01896
2010	5.71717
2015	7.51707
2020	10.00505
2025	12.86337
2030	16.39037
2035	20.01711
2040	23.44022
2045	26.60935
2050	29.30799
2055	31.13036
2060	32.66477
2065	33.78338
2070	34.3237
2075	35.17729
2080	35.96812
2085	36.61542
2090	37.12416
2095	37.52409
2100	37.86061