Year	Percent
1950	9.87313
1955	9.59532
1960	9.88405
1965	9.87034
1970	9.22549
1975	9.45536
1980	9.1501
1985	8.35134
1990	8.28946
1995	8.26608
2000	7.73465
2005	7.26355
2010	6.90846
2015	6.63925
2020	6.41263
2025	6.20646
2030	5.97776
2035	5.72671
2040	5.50093
2045	5.32751
2050	5.19386
2055	5.07525
2060	4.96591
2065	4.86428
2070	4.77426
2075	4.70089
2080	4.6527
2085	4.61324
2090	4.5748
2095	4.54852
2100	4.51603