Year	Percent
1950	11.2632
1955	11.16782
1960	11.60528
1965	12.13828
1970	11.91618
1975	11.80229
1980	12.41317
1985	12.73378
1990	12.36636
1995	12.35442
2000	13.2641
2005	13.79686
2010	12.09755
2015	10.76476
2020	10.48573
2025	9.88809
2030	9.29574
2035	8.61988
2040	7.98958
2045	7.44792
2050	6.98481
2055	6.58092
2060	6.22678
2065	5.92446
2070	5.67639
2075	5.49287
2080	5.3536
2085	5.23659
2090	5.1378
2095	5.05774
2100	4.99484