Year	% of expense
1986	39.945115257958285
1987	49.71023824855119
1988	51.22820919175911
1989	51.49541726965751
1990	41.82141716475795
1991	42.26147647143474
1992	36.98300613020874
1993	33.71722076202323
1994	39.951947829071564
1995	40.41487087844704
1996	21.233554958268495
1997	25.541516245487365
1998	26.738594796426753
1999	26.247721288231716
2000	28.255818311284337
2001	26.387540620576594
2002	25.263364000402188
2003	24.270154875743934
2004	24.342740722365026
2005	23.255225791143978
2006	20.8305688439898
2007	22.216068667281334