The Maine Secretary of State has just posted voter registration data as of September 28, 2018. Here is a link.
The new percentages are: Democratic 33.07%; Republican 27.39%; Green 4.13%; Libertarian .54%; independent and miscellaneous 34.88%.
The last tally was as of June 12, 2018. Then the percentages were: Democratic 32.99%; Republican 27.39%; Green 4.17%; Libertarian .54%; independent and miscellaneous 34.91%. The total number of registered voters declined between the June tally and the September tally.