Year	Percent
1950	15.95179
1955	18.26931
1960	17.24018
1965	16.94499
1970	15.61799
1975	12.17252
1980	10.92595
1985	10.7687
1990	10.72731
1995	9.95861
2000	9.28553
2005	9.1191
2010	8.16364
2015	7.63341
2020	6.90047
2025	6.52904
2030	6.30976
2035	6.08334
2040	5.80113
2045	5.50373
2050	5.26622
2055	5.10346
2060	5.0044
2065	4.91719
2070	4.81806
2075	4.69839
2080	4.5816
2085	4.48966
2090	4.42472
2095	4.37817
2100	4.34326