Year	Percent
1950	13.49779
1955	14.62562
1960	15.81268
1965	17.0508
1970	18.31096
1975	18.60666
1980	17.55652
1985	17.94811
1990	22.31254
1995	22.03766
2000	21.5657
2005	21.35154
2010	20.87538
2015	20.76656
2020	21.93683
2025	23.57485
2030	25.51109
2035	26.95457
2040	27.96829
2045	29.33345
2050	30.0021
2055	30.41374
2060	30.85622
2065	31.13465
2070	31.36006
2075	31.71306
2080	32.32092
2085	32.99348
2090	33.69272
2095	34.38468
2100	35.07247