Year	Percent
1950	6.78679
1955	6.46539
1960	7.52419
1965	8.12483
1970	7.63484
1975	6.15586
1980	5.23692
1985	5.39532
1990	5.18641
1995	5.56624
2000	4.88151
2005	4.57186
2010	4.41639
2015	4.4566
2020	4.65808
2025	4.64919
2030	4.47529
2035	4.2615
2040	4.15523
2045	4.19644
2050	4.32655
2055	4.45285
2060	4.49255
2065	4.45606
2070	4.40401
2075	4.40691
2080	4.46383
2085	4.53681
2090	4.56893
2095	4.54068
2100	4.4739