Year	Jan.	Feb.	Mar.	Apr.	May.	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	24-Hour Annual Avg.	
1998		14859	16450	18191	20815		16739					12135		
1999	15139	16197	17336	19283		23928	24536		22264	21483				
2000			17437	20432