Input (grade 8): From there onward, the city's population progressively decreased: 7,424 in 1920; 6,929 in 1930; and 6,570 in 1940.
Output (grade 10): However, the city's population progressively decreased; in 1920, it was 7,424; in 1930, it was 6,929, and in 1940, it was 6,570.