Year	Percent
1950	11.29626
1955	11.57651
1960	9.96903
1965	9.25164
1970	11.01864
1975	10.91745
1980	10.73955
1985	9.21384
1990	8.82226
1995	8.03764
2000	8.3784
2005	7.86272
2010	7.53284
2015	6.94383
2020	6.54765
2025	6.57168
2030	6.15413
2035	5.79924
2040	5.55298
2045	5.41046
2050	5.30079
2055	5.228
2060	5.14453
2065	5.04928
2070	4.96674
2075	4.91737
2080	4.90484
2085	4.91071
2090	4.91242
2095	4.90386
2100	4.88484