Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2006       Apr May Jun Jul Aug Sep Oct Nov  
2005       Apr May Jun Jul Aug Sep Oct Nov  
2004 Jan     Apr         Sep      
2003       Apr May Jun Jul Aug Sep Oct    
2002   Feb Mar Apr May Jun Jul Aug Sep Oct Nov  
2001   Feb   Apr May Jun Jul Aug Sep Oct Nov Dec
2000       Apr May Jun Jul Aug Sep Oct Nov  
1990 Jan                      
1989 Jan     Apr   Jun Jul Aug Sep Oct Nov Dec
1988       Apr May Jun Jul Aug   Oct Nov Dec