year,facilities
1988,255
1989,262
1990,273
1991,274
1992,276
1993,265
1994,268
1995,251
1996,247
1997,241
1998,278
1999,287
2000,303
2001,317
2002,313
2003,304
2004,321
2005,324
2006,327
2007,328
2008,336
2009,322
2010,316
2011,329
2012,329
2013,331
2014,328
2015,336
2016,328
2017,320