Year	Percent
1950	11.49448
1955	10.07975
1960	9.80303
1965	9.70353
1970	8.95086
1975	7.35501
1980	6.05228
1985	5.8251
1990	6.02663
1995	6.13533
2000	5.88628
2005	5.91422
2010	5.3789
2015	5.08759
2020	5.1172
2025	5.15477
2030	5.10445
2035	4.99554
2040	4.86029
2045	4.76242
2050	4.76594
2055	4.84376
2060	4.89528
2065	4.88626
2070	4.82167
2075	4.75216
2080	4.72094
2085	4.7314
2090	4.74423
2095	4.7318
2100	4.68977