2010: -130,416 (net migration out of California)
2011: -94,122
2012: -73,864
2013: -96,915
2014: -79,892
2015: -129,409
2016: -142,932
2017: -137,895
Compared to population [2], we get: 2010: -0.35%
2011: -0.25%
2012: -0.19%
2013: -0.25%
2014: -0.21%
2015: -0.33%
2016: -0.36%
2017: -0.35%
Conclusion: migration out did spike up starting in 2015. Now, what is it correlated with? You said it was due to taxes, firearms policy, and board policy.Tax changes in 2014/2015: I didn't see any major tax changes [3].
Firearms policy changes in 2014: Long gun serial numbers required to be recorded on new sales. Police can confiscate guns from high-risk individuals for three weeks (signed in 2014, took effect in 2016). [4]
Firearms policy changes in 2015: Firearm Safety Certificate required for all guns (previously only required for handguns). [4]
Board policy change: Passed in 2018. [5]
My take: Migration out of California has increased, but it's not clear why. My personal guess would be cost of living.
[1] https://www.census.gov/data/tables/time-series/demo/geograph... [2] https://www.google.com/publicdata/explore?ds=kf7tgg1uo9ude_&... [3] http://www.library.ca.gov/Content/pdf/crb/reports/FinalVersi... [4] https://en.wikipedia.org/wiki/Gun_laws_in_California [5] https://www.wsj.com/articles/california-moves-to-mandate-fem...