*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19793
19800
19811
19821
19833
19842
198512
19865
19872
19881
19893
19904
19910
19922
19932
19946
19952
19964
19975
19986
19995
2000101
200140
200255
2003164
200485
2005165
2006151
200766
200830
200933
2010234
2011199
2012267
2013263
20144
20150
20160
20170
Total1927