Year	Percent
1950	13.38983
1955	12.69931
1960	11.75473
1965	12.09391
1970	13.96157
1975	13.09049
1980	11.93705
1985	11.23263
1990	9.49236
1995	8.69955
2000	6.95687
2005	7.58797
2010	6.68932
2015	5.19824
2020	4.59306
2025	4.43585
2030	4.47545
2035	4.52754
2040	4.62611
2045	4.50217
2050	4.19336
2055	4.07743
2060	4.19115
2065	4.4052
2070	4.61704
2075	4.73781
2080	4.69804
2085	4.56572
2090	4.51299
2095	4.58484
2100	4.70681