PARIS—Hundreds of empty, parked cars go up in flames in France each New Year’s Eve, set afire by young revelers, a much lamented tradition that appeared in decline this year, which saw only 874 vehicles burned. The number of cars burned overnight has declined compared to New Year’s Eve 2019 when 1,316 vehicles went up in flames, Interior Minister Gerald Darmanin said Saturday on Twitter. Fewer arson attacks occurred because of massive police presence on cities’ streets this New Year’s Eve, enforcing law and order and restrictions on public gatherings and wearing face masks, he said. There is no information on burned cars last year because of a nation-wide lockdown in 2020 during the coronavirus pandemic. Like many countries, France sees cars set on fire during the year for many reasons, including gangs hiding clues of their crimes and people making false insurance claims. But car-torching took a new step …