Year	Percent
1950	13.34192
1955	14.16023
1960	15.12154
1965	16.20607
1970	17.26453
1975	18.32974
1980	18.84086
1985	19.36439
1990	22.81191
1995	22.07774
2000	22.22848
2005	23.46037
2010	24.86546
2015	25.20635
2020	25.92039
2025	26.94012
2030	28.27568
2035	29.10875
2040	29.31504
2045	29.58437
2050	30.40895
2055	31.59596
2060	31.35745
2065	31.32382
2070	31.78172
2075	32.26544
2080	32.8701
2085	33.4424
2090	33.88184
2095	34.299
2100	34.81361