Year	Percent
1950	8.59917
1955	9.04925
1960	8.62378
1965	7.79008
1970	6.81382
1975	5.99565
1980	4.91322
1985	4.21475
1990	4.41214
1995	4.43656
2000	4.54331
2005	4.77827
2010	5.08054
2015	5.57787
2020	6.1543
2025	6.9352
2030	7.96372
2035	9.35194
2040	10.85814
2045	12.09091
2050	13.19622
2055	14.24026
2060	15.97325
2065	18.05292
2070	20.53017
2075	22.6797
2080	24.59794
2085	26.45422
2090	28.32204
2095	30.17825
2100	31.92942