Year	Percent
1950	27.24397
1955	23.81101
1960	25.52755
1965	25.23589
1970	28.94941
1975	30.93386
1980	31.23286
1985	33.06424
1990	29.9755
1995	28.2894
2000	28.0547
2005	27.32413
2010	28.32833
2015	28.7391
2020	27.3131
2025	24.97085
2030	22.67873
2035	21.08222
2040	20.65829
2045	21.12522
2050	21.4351
2055	21.12869
2060	20.53045
2065	19.95453
2070	19.76923
2075	20.05012
2080	20.52098
2085	20.80777
2090	20.74077
2095	20.4406
2100	20.15395