Year	Percent
1950	12.08191
1955	10.4775
1960	12.3642
1965	13.11133
1970	13.07669
1975	13.18371
1980	11.93638
1985	11.24474
1990	11.0596
1995	10.87321
2000	10.56429
2005	10.02364
2010	9.95851
2015	8.56569
2020	7.60164
2025	7.31757
2030	7.30707
2035	7.1204
2040	6.65487
2045	6.07483
2050	5.61985
2055	5.40129
2060	5.36972
2065	5.36163
2070	5.26888
2075	5.10266
2080	4.94208
2085	4.85831
2090	4.86478
2095	4.90387
2100	4.90413