Year	Percent
1950	10.23139
1955	10.24498
1960	10.21926
1965	9.70992
1970	11.51463
1975	11.76092
1980	13.39613
1985	13.08222
1990	12.55218
1995	10.55519
2000	9.83211
2005	9.69966
2010	10.23693
2015	10.40383
2020	10.57724
2025	11.29409
2030	10.2966
2035	9.27784
2040	8.85553
2045	8.81262
2050	9.00142
2055	8.96662
2060	8.53478
2065	7.89766
2070	7.37895
2075	7.1645
2080	7.10258
2085	6.98468
2090	6.68331
2095	6.28358
2100	5.91801