Year	Percent
1950	10.66348
1955	10.65252
1960	9.89883
1965	13.13189
1970	11.20832
1975	11.90257
1980	13.50497
1985	13.46475
1990	13.56238
1995	13.01674
2000	12.54573
2005	12.24138
2010	12.27681
2015	11.6701
2020	11.69903
2025	11.76283
2030	11.38275
2035	10.98279
2040	10.65139
2045	10.37821
2050	10.13119
2055	9.87263
2060	9.58379
2065	9.28424
2070	8.97876
2075	8.7207
2080	8.4491
2085	8.18505
2090	7.90939
2095	7.6402
2100	7.37364