development,origin,values 1981,1981,5012.0 1982,1982,106.0 1983,1983,3410.0 1984,1984,5655.0 1985,1985,1092.0 1986,1986,1513.0 1987,1987,557.0 1988,1988,1351.0 1989,1989,3133.0 1990,1990,2063.0 1982,1981,8269.0 1983,1982,4285.0 1984,1983,8992.0 1985,1984,11555.0 1986,1985,9565.0 1987,1986,6445.0 1988,1987,4020.0 1989,1988,6947.0 1990,1989,5395.0 1983,1981,10907.0 1984,1982,5396.0 1985,1983,13873.0 1986,1984,15766.0 1987,1985,15836.0 1988,1986,11702.0 1989,1987,10946.0 1990,1988,13112.0 1984,1981,11805.0 1985,1982,10666.0 1986,1983,16141.0 1987,1984,21266.0 1988,1985,22169.0 1989,1986,12935.0 1990,1987,12314.0 1985,1981,13539.0 1986,1982,13782.0 1987,1983,18735.0 1988,1984,23425.0 1989,1985,25955.0 1990,1986,15852.0 1986,1981,16181.0 1987,1982,15599.0 1988,1983,22214.0 1989,1984,26083.0 1990,1985,26180.0 1987,1981,18009.0 1988,1982,15496.0 1989,1983,22863.0 1990,1984,27067.0 1988,1981,18608.0 1989,1982,16169.0 1990,1983,23466.0 1989,1981,18662.0 1990,1982,16704.0 1990,1981,18834.0