Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Treaty | Organization | Introduced | Signed | Ratified |
| --- | --- | --- | --- | --- |
| Convention on the Prevention and Punishment of the Crime of Genocide | United Nations | 1948 | - | 1958 |
| International Convention on the Elimination of All Forms of Racial Discrimination | United Nations | 1966 | 1967 | 1970 |
| International Covenant on Economic, Social and Cultural Rights | United Nations | 1966 | 1977 | 1979 |
| International Covenant on Civil and Political Rights | United Nations | 1966 | 1977 | 1979 |
| First Optional Protocol to the International Covenant on Civil and Political Rights | United Nations | 1966 | - | - |
| Convention on the Non-Applicability of Statutory Limitations to War Crimes and Crimes Against Humanity | United Nations | 1968 | - | - |
| International Convention on the Suppression and Punishment of the Crime of Apartheid | United Nations | 1973 | - | - |
| Convention on the Elimination of All Forms of Discrimination against Women | United Nations | 1979 | - | 1993 |
| Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment | United Nations | 1984 | 1986 | 1993 |
| Convention on the Rights of the Child | United Nations | 1989 | 1990 | 1993 |
| Second Optional Protocol to the International Covenant on Civil and Political Rights, aiming at the abolition of the death penalty | United Nations | 1989 | - | - |
| International Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families | United Nations | 1990 | 1991 | 1993 |
| Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women | United Nations | 1999 | - | - |
| Optional Protocol to the Convention on the Rights of the Child on the Involvement of Children in Armed Conflict | United Nations | 2000 | 2000 | 2002 |
| Optional Protocol to the Convention on the Rights of the Child on the Sale of Children, Child Prostitution and Child Pornography | United Nations | 2000 | 2000 | 2001 |
| Convention on the Rights of Persons with Disabilities | United Nations | 2006 | 2007 | 2009 |
| Optional Protocol to the Convention on the Rights of Persons with Disabilities | United Nations | 2006 | - | 2009 |
| International Convention for the Protection of All Persons from Enforced Disappearance | United Nations | 2006 | 2007 | 2013 |
| Optional Protocol to the International Covenant on Economic, Social and Cultural Rights | United Nations | 2008 | - | - |
| Optional Protocol to the Convention on the Rights of the Child on a Communications Procedure | United Nations | 2011 | 2012 | - |
Question:
at most, how many international human rights treaties has monaco ratified in one year?
Answer:
4