Year	Percent
1950	13.52549
1955	14.52872
1960	14.62996
1965	14.96733
1970	15.21306
1975	15.5633
1980	16.01301
1985	15.93155
1990	15.85155
1995	16.32289
2000	14.97483
2005	13.87655
2010	12.80574
2015	12.57344
2020	12.23835
2025	11.78559
2030	10.98801
2035	10.20102
2040	9.58945
2045	9.12356
2050	8.66765
2055	8.17489
2060	7.68339
2065	7.25053
2070	6.90522
2075	6.63157
2080	6.39305
2085	6.17619
2090	5.96669
2095	5.79397
2100	5.65462