Year	Percent
1950	13.48472
1955	12.00925
1960	10.53434
1965	10.0291
1970	10.12275
1975	11.03363
1980	11.04213
1985	11.26723
1990	15.03231
1995	16.16205
2000	18.25892
2005	18.1752
2010	18.75949
2015	20.27858
2020	21.72286
2025	23.57873
2030	24.69204
2035	25.9104
2040	27.08507
2045	28.09207
2050	29.41233
2055	30.48157
2060	30.40331
2065	29.78086
2070	30.33557
2075	31.82674
2080	32.84681
2085	33.39703
2090	33.70531
2095	34.08495
2100	34.67156