Year	Percent
1950	30.59964
1955	31.97968
1960	33.22643
1965	30.84838
1970	27.3018
1975	26.02206
1980	26.09475
1985	27.09845
1990	28.3819
1995	29.62842
2000	29.8047
2005	29.45297
2010	27.31487
2015	24.33182
2020	22.14264
2025	20.68955
2030	20.8159
2035	20.67699
2040	19.97323
2045	19.03538
2050	17.84833
2055	17.46752
2060	17.80926
2065	18.49244
2070	19.00074
2075	19.11827
2080	18.91521
2085	18.67438
2090	18.66804
2095	18.93114
2100	19.25701