Could you please check whether the sentence below sounds natural?
Since 2009 till 2016 Ukraine had contributed consecutively two of its officers to the NATO International Staff.
This is my suggestion: From 2009 to 2016, Ukraine contributed two officers to the NATO International Staff. - It involves a time period in the past, thus past tense. )
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This is my suggestion:
From 2009 to 2016, Ukraine contributed two officers to the NATO International Staff.
- It involves a time period in the past, thus past tense.
BUT: Since + one date, present perfect - (Ukraine has contributed.)
Alex722, Your sentence doesn't sound idiomatically smooth to my ear for some reason. Perhaps it is how the "since" clause was constructed. When you use "since" as referring to something back in time, like " Since I graduated from high school, I had tried many things but being a musician is what I love the most.