Year	Percent
1950	29.5211
1955	27.48582
1960	26.04446
1965	25.79037
1970	25.78793
1975	28.05917
1980	30.90522
1985	32.70367
1990	32.05405
1995	31.76835
2000	31.55106
2005	32.46137
2010	33.13447
2015	32.04824
2020	29.66516
2025	26.38406
2030	24.70288
2035	24.69204
2040	25.00377
2045	24.49464
2050	23.2732
2055	22.09174
2060	21.64992
2065	21.80886
2070	22.11655
2075	22.17288
2080	21.89464
2085	21.51633
2090	21.32872
2095	21.40726
2100	21.5927