Visitation to Yellowstone National Park began to pick up in May as weather improved and interior roads and visitor facilities began to open to the public. Yellowstone National Park reports a 9.3% increase in recreational visitation last month over the same month in 2012. However, Spokesman Al Nash says comparing recreational visitor figures from 2013 with those from 2012 will not provide an accurate picture of year-to-year changes in park visitation since the system for measuring visitations has changed. Nash says for almost two decades, the Park has used a person-per-vehicle multiplier to get the recreational visitor numbers that were reported. However, they conducted a survey last year and found out the numbers they had been using were a little high. A new figure was adopted in January that is lower than the multiplier that was used previously. Actually, Nash says the multiplier is lower than the one used last year, so had the same formula been used, the percentage of increase would have been even higher. Specifically, Nash says the total number of automobiles and RV’s entering Yellowstone for recreational purposes during the first five months of 2013 was up 8.36% compared to the same period in 2012. All park entrances saw an increase in these vehicle numbers in May 2013 compared to the same month the previous year, with the park’s East and South entrances – plowed open with funds from the two respective gateway communities – posting the largest gains.