Year	Percent
1950	12.28584
1955	13.03453
1960	13.61437
1965	12.10348
1970	12.31917
1975	11.19887
1980	10.58462
1985	10.16162
1990	9.6275
1995	8.62458
2000	8.03468
2005	7.89847
2010	7.44783
2015	6.82764
2020	6.27465
2025	5.49202
2030	5.2125
2035	5.01626
2040	4.88923
2045	4.71911
2050	4.52387
2055	4.3566
2060	4.25547
2065	4.23458
2070	4.2467
2075	4.25145
2080	4.23874
2085	4.22668
2090	4.23377
2095	4.28234
2100	4.34302