Year	Percent
1950	12.3569
1955	11.9772
1960	13.12625
1965	13.11228
1970	13.26643
1975	13.66005
1980	14.29026
1985	14.75191
1990	15.47641
1995	15.2654
2000	15.28707
2005	15.28387
2010	15.74739
2015	16.32013
2020	15.80615
2025	15.11151
2030	14.60999
2035	14.15775
2040	13.61514
2045	12.97594
2050	12.29239
2055	11.61939
2060	11.01529
2065	10.4471
2070	9.93848
2075	9.44841
2080	8.97612
2085	8.54672
2090	8.14271
2095	7.78619
2100	7.47346