Year	Percent
1950	16.43962
1955	16.88817
1960	17.43539
1965	17.52969
1970	17.12502
1975	15.14963
1980	12.99793
1985	11.02587
1990	9.46251
1995	8.61586
2000	7.45875
2005	6.48494
2010	6.01028
2015	5.59851
2020	4.91541
2025	4.58843
2030	4.51664
2035	4.44763
2040	4.32922
2045	4.22205
2050	4.13378
2055	4.08982
2060	4.11692
2065	4.19058
2070	4.24634
2075	4.26994
2080	4.27096
2085	4.2847
2090	4.32211
2095	4.38144
2100	4.43356