According to the statistics at the hot link above, The count was 1,451.
"Chronic Homeless" was 574 or 40% of the total, not the 20% you said here three hours ago.
"Mental Illness" was 434 or 30% of the total.
"Chronic Alcohol/drug abuse issues" was 232 or 16% of the total.
Your assertions do not match your source.