Year	Percent
1950	12.29214
1955	11.81726
1960	14.89389
1965	15.27856
1970	15.46628
1975	14.71596
1980	13.68358
1985	13.37534
1990	13.42349
1995	12.00817
2000	11.02982
2005	9.57387
2010	9.02678
2015	8.72474
2020	8.93653
2025	8.23297
2030	7.52546
2035	6.91782
2040	6.48633
2045	6.21989
2050	6.02736
2055	5.8151
2060	5.56286
2065	5.31662
2070	5.12604
2075	5.00665
2080	4.9337
2085	4.86703
2090	4.77822
2095	4.68111
2100	4.59635