Year	Percent
1950	4.94644
1955	4.8674
1960	5.82108
1965	4.61425
1970	6.12589
1975	7.05088
1980	8.16636
1985	8.50322
1990	10.04318
1995	11.24009
2000	12.59498
2005	14.01934
2010	18.07298
2015	20.8788
2020	24.18328
2025	27.96035
2030	30.11451
2035	31.3428
2040	30.37585
2045	28.52709
2050	27.00027
2055	27.86369
2060	29.88989
2065	31.85348
2070	33.41357
2075	34.76678
2080	35.48452
2085	36.15642
2090	36.9845
2095	37.72271
2100	38.17292