Year	Percent
1950	18.5767
1955	17.0675
1960	17.85888
1965	18.53353
1970	18.7479
1975	18.40622
1980	17.89256
1985	17.3881
1990	16.78835
1995	16.0728
2000	15.70332
2005	15.05294
2010	14.77758
2015	14.58465
2020	13.62457
2025	12.72652
2030	12.03721
2035	11.53884
2040	11.10387
2045	10.68515
2050	10.20578
2055	9.69014
2060	9.22999
2065	8.85162
2070	8.51128
2075	8.17734
2080	7.84005
2085	7.51386
2090	7.20201
2095	6.9337
2100	6.70655