Year	Percent
1950	13.54988
1955	13.91048
1960	14.13767
1965	15.09751
1970	15.53026
1975	14.86841
1980	13.48404
1985	14.15106
1990	14.11071
1995	11.57635
2000	11.56661
2005	9.63121
2010	6.72805
2015	5.64764
2020	5.77669
2025	5.54695
2030	5.01875
2035	4.41453
2040	4.05521
2045	3.99
2050	4.06088
2055	4.07302
2060	3.94484
2065	3.74796
2070	3.60844
2075	3.60369
2080	3.70685
2085	3.83235
2090	3.89972
2095	3.90222
2100	3.89604