Year	Percent
1950	5.56496
1955	5.03731
1960	5.6126
1965	6.41587
1970	7.11951
1975	7.36791
1980	6.98909
1985	7.4985
1990	11.01966
1995	14.42967
2000	16.80083
2005	17.39013
2010	19.24545
2015	22.36043
2020	24.92692
2025	27.69455
2030	29.30805
2035	31.09736
2040	32.74572
2045	34.377
2050	36.08618
2055	37.62453
2060	39.24413
2065	39.19593
2070	39.15683
2075	38.86398
2080	38.65392
2085	38.67145
2090	38.73628
2095	38.6733
2100	38.55033