Year	Percent
1950	12.71108
1955	12.12285
1960	11.27026
1965	11.74697
1970	13.66675
1975	12.80188
1980	11.62775
1985	10.89756
1990	9.2423
1995	8.45554
2000	6.56164
2005	7.15386
2010	6.40436
2015	4.97144
2020	4.44676
2025	4.28925
2030	4.32058
2035	4.36092
2040	4.44297
2045	4.31062
2050	4.00462
2055	3.88784
2060	3.9954
2065	4.2019
2070	4.40819
2075	4.52739
2080	4.49149
2085	4.36629
2090	4.31725
2095	4.39231
2100	4.51738