Year	Percent
1950	28.94702
1955	26.11213
1960	24.2424
1965	21.99393
1970	22.04229
1975	25.95647
1980	29.2054
1985	33.48894
1990	35.03095
1995	34.48268
2000	30.84933
2005	28.83723
2010	27.20584
2015	25.65947
2020	24.65782
2025	23.64024
2030	23.10374
2035	22.66863
2040	22.50753
2045	22.33742
2050	22.22849
2055	22.10635
2060	22.02928
2065	21.97506
2070	21.9243
2075	21.85475
2080	21.74569
2085	21.61885
2090	21.48964
2095	21.37876
2100	21.28352