*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
19721
19730
19740
19750
19760
19770
19781
19790
19805
19811
19821
19839
19842
19854
198662
198743
198827
198934
199061
1991126
199262
1993139
199471
1995109
199650
199799
199886
199937
200051
200157
200240
200310
200479
200593
200620
200720
200828
200916
201019
201119
20120
20131
20146
20150
201615
20170
Total1508