Year	Percent
1950	2.6072
1955	2.40363
1960	2.85921
1965	3.9445
1970	5.0614
1975	6.01172
1980	6.23525
1985	6.85105
1990	7.73819
1995	8.6647
2000	9.98552
2005	11.75738
2010	13.18199
2015	17.00049
2020	21.42438
2025	25.94024
2030	29.52298
2035	32.76083
2040	35.10918
2045	36.69389
2050	37.76951
2055	39.19962
2060	40.39865
2065	41.17747
2070	41.68214
2075	42.20262
2080	42.70484
2085	43.17629
2090	43.68612
2095	44.14602
2100	44.57675