Year	Percent
1950	31.52226
1955	28.46191
1960	25.47651
1965	24.28384
1970	25.77474
1975	27.74918
1980	30.02644
1985	31.2795
1990	31.43109
1995	31.03254
2000	29.47832
2005	27.75234
2010	27.00023
2015	27.43248
2020	27.36936
2025	26.7875
2030	26.18788
2035	25.31983
2040	24.81226
2045	24.70578
2050	24.50525
2055	24.44493
2060	24.16005
2065	23.77818
2070	23.4183
2075	23.14659
2080	22.95117
2085	22.77376
2090	22.55633
2095	22.28718
2100	22.00992