Year	Percent
1950	8.48813
1955	6.67652
1960	6.20964
1965	7.53497
1970	9.35398
1975	10.16771
1980	9.56116
1985	9.22626
1990	9.28658
1995	8.67434
2000	6.86003
2005	6.83282
2010	6.02337
2015	5.3966
2020	5.89185
2025	6.1065
2030	6.03572
2035	5.42494
2040	5.11219
2045	5.07652
2050	5.14775
2055	5.24616
2060	5.25328
2065	5.14361
2070	5.00858
2075	4.94468
2080	4.95155
2085	4.98011
2090	4.9775
2095	4.93304
2100	4.87191