From the National Agricultural Statistics Service:
There were at least 14.51 million almond trees sold by California nurseries since June 1, 2015, according to a survey conducted by USDA NASS Pacific Regional Office. Based on the Almond Acreage Survey, plantings from 2012 to 2016 were used to calculate an average trees per acre of 135. This results in almost 108,000 acres of almonds planted since June 2015. Nearly 32,000 of these acres were Nonpareils. A little over 71 percent of the total trees sold (77,000 acres) are new almond orchard acres and 25 percent (27,000 acres) replace existing almond orchards. The remaining trees sold replaced trees within existing almond orchards.