Year	Percent
1950	4.92751
1955	5.28649
1960	5.05292
1965	4.97892
1970	4.83193
1975	4.88725
1980	5.27579
1985	5.74601
1990	6.95831
1995	8.36474
2000	10.15524
2005	11.86924
2010	12.92722
2015	12.68287
2020	15.02631
2025	16.56874
2030	19.9934
2035	23.01983
2040	23.66654
2045	24.85513
2050	25.97136
2055	27.34726
2060	28.53223
2065	29.59126
2070	30.26136
2075	30.93323
2080	31.75483
2085	32.64053
2090	33.44677
2095	34.05688
2100	34.48569