Year	Percent
1950	15.42791
1955	17.66401
1960	17.91611
1965	18.9993
1970	20.60894
1975	20.53962
1980	18.9851
1985	16.76257
1990	15.00438
1995	12.44016
2000	10.75185
2005	9.958
2010	9.97179
2015	9.94443
2020	8.70964
2025	7.66928
2030	6.84288
2035	6.34292
2040	6.11988
2045	5.98978
2050	5.78156
2055	5.48466
2060	5.19857
2065	5.02658
2070	4.97355
2075	4.98489
2080	4.98146
2085	4.92343
2090	4.8253
2095	4.75006
2100	4.72218