Year	Percent
1950	15.08792
1955	16.35567
1960	15.7063
1965	18.12106
1970	19.11399
1975	19.68779
1980	15.51106
1985	15.43024
1990	11.89647
1995	10.84294
2000	11.06444
2005	9.3846
2010	9.13377
2015	7.89635
2020	7.53499
2025	6.5956
2030	6.08814
2035	5.91776
2040	5.86789
2045	5.86176
2050	5.78427
2055	5.61331
2060	5.44678
2065	5.3706
2070	5.36496
2075	5.36862
2080	5.3309
2085	5.24976
2090	5.15652
2095	5.09063
2100	5.06155