Year	Percent
1950	13.81913
1955	17.49458
1960	18.54774
1965	19.59549
1970	20.66492
1975	21.20907
1980	20.76946
1985	20.46333
1990	19.34119
1995	16.35194
2000	16.62291
2005	16.21774
2010	16.16096
2015	14.29145
2020	12.82343
2025	11.95782
2030	11.38947
2035	10.85579
2040	10.21274
2045	9.49398
2050	8.76925
2055	8.14127
2060	7.63011
2065	7.18923
2070	6.7933
2075	6.4081
2080	6.05034
2085	5.73508
2090	5.46986
2095	5.26078
2100	5.08488