Year	Percent
1950	5.55999
1955	5.85088
1960	6.13541
1965	7.3252
1970	7.68527
1975	7.71673
1980	7.94135
1985	7.96198
1990	10.03534
1995	9.9957
2000	10.39824
2005	10.83787
2010	11.61163
2015	12.97108
2020	14.65158
2025	16.78202
2030	19.01096
2035	21.20865
2040	23.28692
2045	25.83801
2050	28.95641
2055	32.26199
2060	35.45339
2065	37.35824
2070	38.73503
2075	39.50404
2080	41.47116
2085	43.0535
2090	44.17512
2095	44.92117
2100	45.46187