Year	Percent
1950	11.00948
1955	13.94085
1960	13.55659
1965	13.90706
1970	13.7431
1975	14.03996
1980	10.40339
1985	11.00467
1990	8.3215
1995	8.08144
2000	7.79473
2005	7.6849
2010	6.80545
2015	5.79304
2020	5.3645
2025	4.79808
2030	4.83661
2035	5.09696
2040	5.12392
2045	4.88519
2050	4.59856
2055	4.42005
2060	4.42829
2065	4.58476
2070	4.69649
2075	4.65319
2080	4.48415
2085	4.32654
2090	4.26686
2095	4.30908
2100	4.38202