Year	Percent
1950	6.23479
1955	6.24841
1960	6.19893
1965	9.54843
1970	12.47222
1975	12.40815
1980	12.58781
1985	12.61555
1990	15.1537
1995	13.07827
2000	13.9424
2005	12.38
2010	12.46567
2015	13.07216
2020	12.90944
2025	12.39795
2030	11.68767
2035	11.24199
2040	10.94548
2045	10.62654
2050	10.2573
2055	9.89021
2060	9.52092
2065	9.17607
2070	8.84669
2075	8.55909
2080	8.29799
2085	8.04495
2090	7.78622
2095	7.54952
2100	7.3095