Year	Percent
1950	8.39933
1955	8.21158
1960	8.93626
1965	10.2551
1970	9.60733
1975	8.28142
1980	7.3415
1985	8.10166
1990	8.66238
1995	7.93116
2000	7.30673
2005	6.36484
2010	5.03996
2015	4.58812
2020	4.92643
2025	4.98616
2030	4.93669
2035	4.78062
2040	4.5048
2045	4.28363
2050	4.30579
2055	4.49276
2060	4.64703
2065	4.69299
2070	4.65134
2075	4.58817
2080	4.58899
2085	4.67675
2090	4.78125
2095	4.8308
2100	4.79072