How did the Permanent School Fund add $98 Million in 6 months?

How did the Permanent School Fund add $98 million in the past 6 months? A 3x increase in Oil & gas leases for Texas’ publicly held land 

How many acres of state land have been leased in the last 6 months? 13,000+ acres

What does this mean for the Permanent School Fund? $98 million in revenue

Average price per acre: $7,365, compared to around $2,500 per acre in January and about $1,700 in August 2015

Statesman | Texas oil and gas leases jump despite oil price slump