Such statistical analysis can be made with transaction TAANA.
call TAANA
directly click Execute
Enter table MSEG
click the button to select a variant
click Ad-Hoc Variant button
Move the fields you want count from the right to the left
in your case BWART and MJAHR
click okay
the Ad-hoc variant is flagged, just click continue
select online or background depending on the volume of records you have in MSEG and click continue
later find your table in the tree on the left, click the variant and see the results on the right
you get a number of movements per movement types and year
the result has a count for any year, you can then filter or analyze it further in Excel