Year	Percent
1950	10.51751
1955	9.11966
1960	8.08796
1965	12.46723
1970	12.39881
1975	11.77169
1980	11.65868
1985	11.69557
1990	10.16229
1995	9.7028
2000	9.63147
2005	9.21616
2010	9.07631
2015	8.15625
2020	7.08197
2025	7.14198
2030	6.73959
2035	6.26274
2040	5.82513
2045	5.47538
2050	5.23706
2055	5.14346
2060	5.11361
2065	5.0358
2070	4.92952
2075	4.82992
2080	4.77838
2085	4.77318
2090	4.79118
2095	4.78255
2100	4.74827