Year	Percent
1950	13.68469
1955	14.12603
1960	14.83264
1965	13.33288
1970	12.56378
1975	9.3746
1980	7.55697
1985	7.00266
1990	7.91604
1995	7.45062
2000	7.65435
2005	6.95657
2010	6.49436
2015	6.02645
2020	4.98347
2025	4.98384
2030	5.17439
2035	5.39737
2040	5.36614
2045	5.13689
2050	4.90298
2055	4.84383
2060	4.97162
2065	5.11826
2070	5.14057
2075	5.02565
2080	4.87532
2085	4.80595
2090	4.82636
2095	4.90373
2100	4.93603