Citizens are consulting the Nio EP9 electric supercar at a shopping mall in Xi'an, China, on ... [+] May 26, 2024. (Photo by Costfoto/NurPhoto via Getty Images)NurPhoto via Getty ImagesChinese luxury electric vehicle maker Nio stock, has declined by about 41% year-to-date. This compares to rival Xpeng stock which is down by 29% over the same period. Nio recently published a strong set of delivery numbers for May shipping a total of 20,544 vehicles for the month, up almost 234% from 6,155 vehicles in th ...