end of 2015 at 80%. Historically, sixteen winters between 1951 and 2015 had created El Niño. Six of those had below-average rainfall, five had average rainfall, and five had above-average rainfall. However, as of May 2015, drought conditions had worsened and above average ocean temperatures had not resulted in large storms. The drought led to Governor Jerry Brown's instituting mandatory 25 percent water restrictions in June 2015. In response to heightening drought conditions, California tightened fishing restrictions in many areas of the state. Streams and rivers on the northern coast had unprecedented amounts of fishing bans. In February 2015, the California Fish and Game Commission voted unanimously to further tighten regulations on both recreational and commercial fishing, and the U.S. Endangered Species Act listed steelhead as threatened and coho salmon as endangered. 2016 Many millions of California trees died from the drought—approximately 102 million, including 62 million in 2016 alone. By the end of 2016, 30% of California had emerged from the drought, mainly in the northern half of the state, while 40% of the state remained in the extreme or exceptional drought levels. 2017 Heavy rains in January 2017 had significant benefit to the state's northern water reserves, despite widespread power outages and erosional damage in the wake of the deluge. Among the casualties of the rain was 1,000 year-old Pioneer Cabin Tree in Calaveras Big Trees State Park, which toppled on January 8, 2017. Since then, a very large percentage of the drought has been eliminated in California due to a persistent weather pattern which allowed rounds of storm systems to consistently hammer the state, with the snowpack rising to well above average. By January 24, 2017, not one portion of the state was in "Exceptional" drought, the highest category on the Drought Monitor. On February 21, no part of the state was in the next-lower category of "Extreme" drought, and over 60% of the state's area was no longer in any level of drought. A record year of precipitation in California certainly brought the state out of the bad situation and more or less back to equilibrium. Unexpectedly, this occurred during a La Niña winter because California typically benefits from the El Niño winters, which were occurring in the recent precious years. On April 7, 2017, Governor Jerry Brown declared the drought over. However, according to the United States Drought Monitor the state was not entirely drought-free