Year	Percent
1950	12.33367
1955	12.87129
1960	13.50136
1965	10.95657
1970	11.35545
1975	12.1887
1980	12.91453
1985	12.46015
1990	12.83761
1995	12.0613
2000	13.24848
2005	12.12302
2010	11.45268
2015	10.64314
2020	9.60497
2025	9.17663
2030	8.75635
2035	8.37274
2040	7.95052
2045	7.48777
2050	7.05674
2055	6.72076
2060	6.49053
2065	6.32967
2070	6.19931
2075	6.06564
2080	5.9462
2085	5.83479
2090	5.76698
2095	5.72118
2100	5.68787