Year	Percent
1950	29.51634
1955	28.39474
1960	27.43264
1965	26.18779
1970	24.95136
1975	25.5835
1980	25.72663
1985	26.10311
1990	26.44661
1995	26.35571
2000	26.80982
2005	26.93228
2010	26.95846
2015	26.83793
2020	26.82323
2025	27.38453
2030	28.31781
2035	29.22998
2040	29.93893
2045	30.37382
2050	30.59445
2055	30.79726
2060	31.00064
2065	31.10264
2070	31.06495
2075	30.92329
2080	30.72142
2085	30.50085
2090	30.27671
2095	30.03234
2100	29.76335