Year	Percent
1950	5.19911
1955	4.84103
1960	4.47002
1965	3.15011
1970	3.14064
1975	2.87423
1980	2.41811
1985	2.15764
1990	2.1056
1995	2.41323
2000	3.02404
2005	3.62324
2010	3.37866
2015	3.54178
2020	5.25819
2025	7.6814
2030	11.55683
2035	15.62221
2040	18.52549
2045	21.07384
2050	22.47013
2055	22.90675
2060	23.8832
2065	24.30827
2070	25.07918
2075	26.2382
2080	27.47248
2085	28.26274
2090	28.82523
2095	29.37176
2100	29.96754