Year	Percent
1950	32.31231
1955	31.97674
1960	32.4979
1965	30.29443
1970	29.48033
1975	28.75888
1980	28.77673
1985	29.02838
1990	27.95878
1995	28.03829
2000	29.19651
2005	29.75354
2010	29.89683
2015	28.22286
2020	25.28474
2025	23.2568
2030	21.85052
2035	21.6175
2040	22.75463
2045	23.39517
2050	22.86134
2055	22.33981
2060	22.05055
2065	22.1735
2070	22.62034
2075	23.04297
2080	23.01387
2085	22.55387
2090	22.04402
2095	21.77788
2100	21.79539