Year	Percent
1950	13.53282
1955	10.72213
1960	8.52286
1965	8.30282
1970	8.59425
1975	9.04982
1980	7.31428
1985	6.26641
1990	5.44572
1995	4.85722
2000	4.66969
2005	4.418
2010	4.3209
2015	4.21609
2020	4.06597
2025	3.95528
2030	3.92314
2035	3.95686
2040	4.0185
2045	4.07121
2050	4.09703
2055	4.10135
2060	4.11721
2065	4.1743
2070	4.25341
2075	4.32411
2080	4.37064
2085	4.38032
2090	4.37078
2095	4.36355
2100	4.36147