Year	Percent
1950	17.21136
1955	16.8503
1960	17.36935
1965	17.8522
1970	18.0102
1975	17.85809
1980	17.00805
1985	16.26066
1990	14.97796
1995	13.39822
2000	12.10462
2005	10.4579
2010	9.60641
2015	8.39075
2020	7.77314
2025	7.02134
2030	6.1283
2035	5.5442
2040	5.28635
2045	5.25726
2050	5.26598
2055	5.15168
2060	4.92759
2065	4.70203
2070	4.5812
2075	4.57753
2080	4.6193
2085	4.62488
2090	4.57011
2095	4.48788
2100	4.43194