Year	Percent
1950	31.48131
1955	29.77329
1960	28.04797
1965	27.27266
1970	26.41794
1975	26.69391
1980	26.43095
1985	25.68384
1990	24.29491
1995	25.01835
2000	26.31456
2005	27.39058
2010	27.37272
2015	26.59547
2020	26.50095
2025	27.24307
2030	28.66878
2035	29.93421
2040	30.86002
2045	31.4312
2050	31.73494
2055	32.04012
2060	32.29048
2065	32.31362
2070	32.0814
2075	31.69305
2080	31.22503
2085	30.75992
2090	30.30202
2095	29.81442
2100	29.30392