Year	Percent
1950	16.4563
1955	16.62313
1960	15.9882
1965	14.59353
1970	10.27332
1975	9.3185
1980	7.85127
1985	7.46042
1990	6.55359
1995	5.6468
2000	4.64438
2005	3.52349
2010	3.70112
2015	4.26579
2020	5.4815
2025	5.70279
2030	5.50563
2035	4.77784
2040	4.3904
2045	4.50565
2050	4.90964
2055	5.29734
2060	5.45212
2065	5.30532
2070	5.01724
2075	4.84745
2080	4.88947
2085	5.04838
2090	5.16115
2095	5.13892
2100	4.98302