Year	Percent
1950	16.17699
1955	16.19923
1960	16.75123
1965	18.126
1970	16.68648
1975	15.78139
1980	15.37122
1985	14.31919
1990	12.93451
1995	10.5052
2000	8.6632
2005	7.89625
2010	8.09581
2015	9.08068
2020	8.37598
2025	7.41891
2030	6.53479
2035	6.02861
2040	5.97432
2045	6.08379
2050	6.04035
2055	5.76576
2060	5.4041
2065	5.1611
2070	5.1036
2075	5.15052
2080	5.17441
2085	5.10298
2090	4.9576
2095	4.82804
2100	4.77398