Adding additional ( not necessary) information in task 1 writing

[AnaEng]

Which one of these are best to use to add additional information when describing a chart

1-It is worth noting that Vietnam didn't generate nuclear power between 2003 and 2008.
2-It is worth mentioning Vietnam didn't generate nuclear power between 2003 and 2008.
3-It is worthwhile to mention that Vietnam didn't generate nuclear power between 2003 and 2008.

 

[teechar]

Which one of these are best to use to add additional information when describing a chart

You need a singular verb "is" to go with "which one". Try:
Which one of these (sentences) works best for adding extra information when describing a chart?

1-It is worth noting that Vietnam didn't did not generate nuclear power between 2003 and 2008.

That one, but note the correction. Do not use contractions in formal writing.

2-It is worth mentioning Vietnam ...

OK, but "mentioning" is weaker (and potentially less formal) than "noting".

3-It is worthwhile to mention that Vietnam ...

No. That's no good.