git log --all --no-merges --numstat --pretty=format:"%an" | awk '
    /^[^0-9-]/ {user=$0}
    /^[0-9]/ {add[user]+=$1; del[user]+=$2; total+=$1+$2}
    END {
        for (u in add)
            printf "%s: %d/%d = %.2f%%\n", u, add[u]+del[u], total, (add[u]+del[u])*100/total
    }' | sort -t= -k2 -nr

Station Chenqiao: 634940/1677098 = 37.86%
liuc: 589876/1677098 = 35.17%
tongyuhu: 262416/1677098 = 15.65%
zhenwei: 57935/1677098 = 3.45%
Shuo Dai: 56632/1677098 = 3.38%
niuhao: 49964/1677098 = 2.98%
SunYupeng: 17014/1677098 = 1.01%
daisy: 4615/1677098 = 0.28%
陈桥驿站: 2879/1677098 = 0.17%
ohhhhDaisy: 718/1677098 = 0.04%
zhenwei688: 106/1677098 = 0.01%      <--
Administrator: 3/1677098 = 0.00%

git log --reverse --format="%ad" --date=short | head -n 1

2020-11-25