Year	Percent
1950	15.49945
1955	19.6607
1960	18.68788
1965	18.09368
1970	17.9594
1975	18.22248
1980	17.73285
1985	17.42094
1990	16.15895
1995	15.28263
2000	14.15252
2005	12.75594
2010	11.73891
2015	11.17406
2020	11.19492
2025	11.03725
2030	10.5188
2035	9.58764
2040	8.56821
2045	7.88375
2050	7.61699
2055	7.51905
2060	7.30805
2065	6.9013
2070	6.41045
2075	6.04664
2080	5.91529
2085	5.93587
2090	5.92768
2095	5.79572
2100	5.54331