Year	Percent
1950	18.29173
1955	17.70896
1960	17.0997
1965	16.59124
1970	16.34194
1975	16.47702
1980	16.73301
1985	17.47871
1990	18.1354
1995	19.74242
2000	21.76145
2005	23.6761
2010	25.4338
2015	25.98575
2020	25.90738
2025	25.8123
2030	26.0201
2035	26.35761
2040	26.49471
2045	26.05775
2050	25.14742
2055	24.24176
2060	23.67422
2065	23.35346
2070	22.99695
2075	22.72249
2080	22.42654
2085	22.16133
2090	21.95174
2095	21.81407
2100	21.70891