4% Est. 1997 0.649581 1.539454 3.8744% 1988 7.980412 0.125307 3.3218% 1987 3.799355 0.263203 3.1640% 1986 2.447301 0.408613 2.6144% 1985 13.692003 0.073035 2.9715% 1984 1.256705 0.795732 3.6576% 1983 0.376338 2.657185 3.8998% 1982 0.928504 1.077001
cosponsoring