Year	Percent
1950	2.5764
1955	3.57971
1960	4.3335
1965	4.08319
1970	3.77538
1975	4.18002
1980	4.89128
1985	5.22082
1990	6.43109
1995	7.18758
2000	7.25454
2005	7.3395
2010	6.98138
2015	6.87366
2020	7.62108
2025	8.04655
2030	8.68115
2035	9.60039
2040	9.99248
2045	10.33882
2050	10.46045
2055	11.82099
2060	13.68418
2065	15.93009
2070	18.02819
2075	19.49057
2080	20.44814
2085	21.46144
2090	22.77244
2095	24.35178
2100	25.97501