Year	Percent
1950	27.0086
1955	27.40741
1960	27.21085
1965	27.2748
1970	28.31913
1975	29.66277
1980	31.22532
1985	32.04712
1990	32.93187
1995	33.03788
2000	32.46051
2005	32.10454
2010	30.70226
2015	29.49131
2020	27.39293
2025	26.28552
2030	26.13307
2035	25.73135
2040	25.16999
2045	23.89503
2050	22.39019
2055	21.5751
2060	21.23653
2065	21.09252
2070	20.81727
2075	20.26406
2080	19.59577
2085	19.11818
2090	18.96899
2095	19.01942
2100	19.05135