Year	Percent
1950	9.69245
1955	9.13366
1960	8.98507
1965	10.05091
1970	11.15219
1975	11.82125
1980	12.61581
1985	11.78556
1990	10.25804
1995	8.95349
2000	8.41514
2005	8.89883
2010	7.99883
2015	7.36391
2020	7.51572
2025	6.92823
2030	6.62531
2035	6.12954
2040	5.8961
2045	5.80924
2050	5.71681
2055	5.55749
2060	5.35661
2065	5.18684
2070	5.06474
2075	4.98725
2080	4.91388
2085	4.82674
2090	4.72467
2095	4.63373
2100	4.57516