Year	Percent
1950	9.2355
1955	10.02808
1960	9.21726
1965	9.17139
1970	9.52829
1975	10.37423
1980	12.93089
1985	11.14899
1990	10.79725
1995	9.32874
2000	9.62053
2005	9.43898
2010	9.31418
2015	8.15478
2020	6.50253
2025	6.79628
2030	6.78407
2035	6.6105
2040	6.39092
2045	6.08735
2050	5.75756
2055	5.55016
2060	5.529
2065	5.55774
2070	5.51456
2075	5.4112
2080	5.29604
2085	5.21543
2090	5.18814
2095	5.19569
2100	5.19762