*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19832
19840
19850
19860
19870
19882
19897
19903
19912
19920
19930
199440
199539
199614
199758
199831
199988
200046
200188
2002139
2003194
200446
2005102
2006113
2007259
2008315
2009382
2010589
2011319
2012137
2013194
20140
20150
20160
20170
Total3211