Year	Percent
1950	15.19433
1955	15.09544
1960	15.21021
1965	15.23276
1970	14.59767
1975	14.61992
1980	14.30223
1985	14.06627
1990	13.93913
1995	15.17051
2000	17.29546
2005	20.50475
2010	23.22854
2015	23.88194
2020	24.24961
2025	25.12064
2030	26.36426
2035	27.18688
2040	26.75302
2045	25.23022
2050	23.95707
2055	24.49937
2060	25.58316
2065	26.50747
2070	26.45521
2075	24.96128
2080	23.7415
2085	23.28862
2090	23.51099
2095	23.88873
2100	23.89397