Light business jets - how many are sold each year? This AOPA article  says

https://www.aopa.org/news-and-media/all-news/2018/october/16/hondajets-get-performance-upgrades


  The company is delivering four to five aircraft a month from its Greensboro, North Carolina, factory, the CEO said. In 2017 and the first half of 2018, the HondaJet was the most delivered light jet in the market. All in all, 92 HondaJets are in service with a 99.7-percent dispatch rate, Fujino explained.


So that's 48 to 60 a year.  What other light jets are available for purchase?
For the most recent data available, which is in 2017, GAMA reports that 676 business jets sold worldwide. You can see a breakdown by manufacturer here.

Unfortunately, not all manufacturers detail the models sold. Light business jets typically sell in higher volume, due to their lower cost point. A rough estimate of 60% of sales being light jets would give a rough number of ~405 light business jets sold in 2017. There is no way to ensure this is accurate, but it should give you a ballpark number.