Please help to check my IELTS writing (Task 1)

The table gives information about the opening date, length, and passengers per year of the metro systems in six cities.

Overall cities opening the metro systems earlier usually cover longer routes and send more passengers per year. London was the first city to open underground railway systems in 1863, which also covers the longest route among the six cities.

Pairs opened the underground railway systems 37 years after London, the length of which is almost half that of London. The opening time of the metro in Washington DC was 50 years after Tokyo in 1976, however, the length of Tokyo and DC is similar. The length of Tokyo metro is only 30 kilometres longer than that of DC. Kyoto and Los Angles opened the metro services in 1981 and 2001 respectively, but the length of Los Angles is more than twice that of Kyoto.

Although Tokyo only owns 155 kilometres of the metro, it has the largest number of passengers per year. The number of passengers per year in Tokyo is 1,927 million, which is almost twice that of Pairs. The number of passengers in London ranks number three among the six cities, which is five times that of DC. The passenger number per year of Kyoto and Los Angeles is similar, with 45 million and 50 million respectively.