Year	Percent
1950	30.29753
1955	29.94294
1960	29.47799
1965	27.8299
1970	26.05746
1975	26.22849
1980	26.6953
1985	28.28129
1990	28.72451
1995	29.92487
2000	30.31694
2005	29.72015
2010	27.35285
2015	24.49349
2020	22.51219
2025	21.78812
2030	21.72603
2035	21.4167
2040	20.44026
2045	19.26844
2050	18.43752
2055	18.20855
2060	18.57745
2065	19.11387
2070	19.37944
2075	19.30362
2080	19.07768
2085	18.9589
2090	19.08696
2095	19.39007
2100	19.64843