Year	Percent
1950	3.97531
1955	3.74189
1960	4.31654
1965	5.01355
1970	5.37223
1975	6.11629
1980	5.5431
1985	5.49465
1990	6.53245
1995	7.65844
2000	8.39185
2005	8.8261
2010	9.35616
2015	10.14342
2020	11.27097
2025	13.08725
2030	15.04109
2035	17.25784
2040	19.74684
2045	22.24333
2050	24.44809
2055	26.40544
2060	28.41564
2065	30.16112
2070	31.65038
2075	33.0224
2080	34.16427
2085	35.06287
2090	35.74839
2095	36.31704
2100	36.80535