Year	Percent
1950	28.91348
1955	27.96461
1960	27.00978
1965	26.70428
1970	26.56763
1975	27.57474
1980	28.37583
1985	29.23847
1990	30.19918
1995	31.45782
2000	32.28347
2005	32.88191
2010	33.23154
2015	33.03556
2020	32.83546
2025	31.893
2030	30.84393
2035	30.38575
2040	30.09321
2045	29.76642
2050	29.17801
2055	28.24105
2060	27.36004
2065	26.62046
2070	25.99671
2075	25.41917
2080	24.8278
2085	24.2493
2090	23.73901
2095	23.31726
2100	22.9855