Year	Percent
1950	9.97315
1955	9.91915
1960	9.79078
1965	9.95595
1970	10.57737
1975	11.47831
1980	12.47951
1985	13.74356
1990	17.34451
1995	17.84195
2000	18.37193
2005	19.48779
2010	21.47544
2015	23.74909
2020	26.43322
2025	29.02182
2030	30.33113
2035	31.22373
2040	31.96491
2045	32.78463
2050	33.3287
2055	34.03635
2060	34.24611
2065	34.26486
2070	34.72677
2075	35.21412
2080	35.67412
2085	36.0741
2090	36.44547
2095	36.80899
2100	37.258