Year	Percent
1950	7.30393
1955	6.58764
1960	6.11071
1965	5.88147
1970	7.06657
1975	7.13173
1980	7.73534
1985	8.34237
1990	10.74855
1995	12.20984
2000	14.48308
2005	17.16617
2010	18.8086
2015	21.85115
2020	24.60259
2025	27.50006
2030	29.13225
2035	30.0696
2040	29.83571
2045	29.63905
2050	29.49986
2055	30.02687
2060	30.76376
2065	31.55229
2070	32.11336
2075	32.97145
2080	33.91514
2085	34.71297
2090	35.34852
2095	35.85255
2100	36.29791