Year	Percent
1950	13.02253
1955	11.93059
1960	12.49278
1965	13.8358
1970	14.0607
1975	14.02469
1980	13.52675
1985	12.85902
1990	12.19242
1995	10.99873
2000	10.09896
2005	9.89041
2010	9.58797
2015	9.04093
2020	8.85223
2025	8.17197
2030	7.62593
2035	7.21643
2040	6.92732
2045	6.68423
2050	6.44167
2055	6.20621
2060	5.99039
2065	5.81834
2070	5.68694
2075	5.5886
2080	5.4871
2085	5.39045
2090	5.30299
2095	5.23012
2100	5.17785