Year	Percent
1950	13.47707
1955	13.51729
1960	13.20059
1965	14.24216
1970	14.79077
1975	15.18086
1980	14.28286
1985	14.63954
1990	14.22109
1995	13.43771
2000	12.32732
2005	11.51217
2010	10.78545
2015	9.63303
2020	8.80529
2025	8.15369
2030	7.50139
2035	6.88787
2040	6.33307
2045	5.87566
2050	5.53821
2055	5.26756
2060	5.04291
2065	4.86186
2070	4.71741
2075	4.61407
2080	4.538
2085	4.48814
2090	4.45844
2095	4.43885
2100	4.43113