Year	Percent
1950	16.09327
1955	19.31159
1960	19.25564
1965	19.13622
1970	19.0668
1975	19.65389
1980	19.85707
1985	19.01143
1990	17.41051
1995	15.39453
2000	14.9799
2005	13.86069
2010	12.82349
2015	12.10509
2020	9.96914
2025	10.15544
2030	9.70489
2035	9.12205
2040	8.56008
2045	7.84192
2050	7.16407
2055	6.64372
2060	6.29272
2065	6.03812
2070	5.80529
2075	5.56568
2080	5.33666
2085	5.14943
2090	5.03216
2095	4.96928
2100	4.92749