Year	Percent
1950	13.76987
1955	12.40222
1960	12.83141
1965	12.8774
1970	11.66404
1975	12.15539
1980	10.95701
1985	9.23342
1990	9.5378
1995	8.01806
2000	8.84419
2005	6.8726
2010	6.23329
2015	6.73953
2020	6.13998
2025	5.69833
2030	5.42897
2035	5.3546
2040	5.31756
2045	5.19837
2050	5.04945
2055	4.8665
2060	4.74555
2065	4.66933
2070	4.58689
2075	4.47393
2080	4.33963
2085	4.20316
2090	4.09694
2095	4.02469
2100	3.99181