Year	Percent
1950	5.60231
1955	5.15322
1960	4.4979
1965	4.09338
1970	4.34871
1975	4.75265
1980	5.03734
1985	4.99871
1990	5.67465
1995	6.11657
2000	7.15044
2005	8.2822
2010	9.20873
2015	11.15084
2020	13.53551
2025	16.30954
2030	18.43803
2035	20.50428
2040	21.80476
2045	23.66224
2050	25.41887
2055	27.43183
2060	28.81981
2065	29.26896
2070	30.12162
2075	31.06935
2080	31.92716
2085	32.67112
2090	33.27797
2095	33.74315
2100	34.12524