*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19842
19850
19861
19871
19882
19892
19907
19917
199214
19936
19948
19956
19968
19975
19985
19992
20003
20017
20021
20039
200411
200514
200620
200711
200821
20092
20102
20110
20124
20135
20140
20150
20160
20171
20180
20190
20200
20210
20220
20230
20240
Total187