Year	Percent
1950	11.28995
1955	10.5426
1960	10.30534
1965	8.26216
1970	9.86379
1975	11.27784
1980	11.25649
1985	11.97918
1990	10.28355
1995	9.19441
2000	9.58577
2005	10.54981
2010	9.32977
2015	8.44899
2020	7.85364
2025	7.04496
2030	7.09089
2035	6.69726
2040	6.29354
2045	6.04081
2050	5.8134
2055	5.62185
2060	5.47874
2065	5.35293
2070	5.22923
2075	5.10835
2080	5.01609
2085	4.95167
2090	4.90733
2095	4.86545
2100	4.82694