Year	Percent
1950	28.34436
1955	28.99278
1960	30.88066
1965	27.49175
1970	23.98713
1975	24.31092
1980	26.22478
1985	30.06978
1990	30.76172
1995	30.71534
2000	30.81609
2005	32.01374
2010	32.80484
2015	33.08198
2020	32.13048
2025	29.88961
2030	27.89517
2035	28.7131
2040	29.93022
2045	31.0302
2050	30.35971
2055	28.30564
2060	27.23153
2065	27.03548
2070	27.17471
2075	26.97674
2080	26.25328
2085	25.2862
2090	24.44819
2095	23.9381
2100	23.6862