Year	Percent
1950	9.461
1955	8.96904
1960	9.93785
1965	11.15271
1970	13.26001
1975	12.9989
1980	12.90398
1985	13.37785
1990	16.2581
1995	17.57125
2000	18.63807
2005	20.62148
2010	24.86923
2015	26.97639
2020	29.43909
2025	31.05564
2030	31.61211
2035	32.61786
2040	34.12988
2045	35.82756
2050	37.58822
2055	39.1283
2060	39.74158
2065	39.68781
2070	39.39608
2075	39.33992
2080	39.38179
2085	39.51824
2090	39.617
2095	39.60985
2100	39.62035