Year	Percent
1950	16.43408
1955	15.47608
1960	14.70228
1965	13.45619
1970	11.34162
1975	10.83165
1980	10.19184
1985	9.30763
1990	8.16002
1995	8.03919
2000	7.06241
2005	6.49118
2010	5.96211
2015	5.21339
2020	4.92699
2025	4.70801
2030	4.54831
2035	4.35094
2040	4.13903
2045	3.96388
2050	3.85406
2055	3.81659
2060	3.80724
2065	3.79107
2070	3.76105
2075	3.73598
2080	3.73468
2085	3.7782
2090	3.84407
2095	3.905
2100	3.94285