Year	Percent
1950	8.61526
1955	6.45607
1960	5.41348
1965	5.15656
1970	5.32663
1975	5.75951
1980	6.24246
1985	6.86189
1990	8.21139
1995	8.86928
2000	9.25654
2005	10.35907
2010	11.78228
2015	13.93347
2020	16.42022
2025	18.86011
2030	21.1529
2035	23.19051
2040	25.60737
2045	27.53753
2050	28.78146
2055	29.94123
2060	31.07125
2065	32.70138
2070	34.59939
2075	36.00643
2080	37.07467
2085	37.83716
2090	38.48237
2095	39.18439
2100	39.8909