*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19821
19830
19840
19850
19863
198711
198821
19899
19903
19916
19928
19935
19948
19952
19964
199718
19988
199911
200031
20011
200210
200330
200418
200510
200612
200711
200828
200921
201019
201132
201241
201351
201418
201522
201640
201727
201821
201916
202012
202112
202216
20233
20241
Total622