Year	Percent
1950	8.93382
1955	8.81655
1960	9.41447
1965	9.46532
1970	9.06342
1975	8.80344
1980	8.01595
1985	6.25144
1990	5.10277
1995	4.64874
2000	4.40674
2005	4.76557
2010	5.05788
2015	4.44861
2020	4.06299
2025	3.7529
2030	3.64012
2035	3.71271
2040	3.86445
2045	3.95393
2050	3.90184
2055	3.79989
2060	3.76271
2065	3.82372
2070	3.95973
2075	4.10345
2080	4.17423
2085	4.1534
2090	4.08484
2095	4.03823
2100	4.03509