Year	Percent
1950	12.75673
1955	13.08763
1960	14.19343
1965	13.99932
1970	13.9314
1975	14.05681
1980	14.99061
1985	14.75
1990	14.52008
1995	15.09259
2000	15.43582
2005	13.69743
2010	11.99825
2015	11.63955
2020	10.84251
2025	10.07662
2030	9.25336
2035	8.5042
2040	7.86932
2045	7.3311
2050	6.86722
2055	6.46483
2060	6.12304
2065	5.84271
2070	5.63404
2075	5.47357
2080	5.33851
2085	5.22454
2090	5.12906
2095	5.05008
2100	4.98792