When did the United Nations performance-oriented packaging "grandfather" clause apply to government-owned goods?

The "grandfather" clause related to performance-oriented packaging established by the United Nations was applicable to government-owned goods starting in 1990. This stipulation was crucial as it referenced the lifecycle of existing government contracts and procurement processes, allowing for certain protections and transitions as the regulations surrounding packaging evolved. The decision to include a "grandfather" clause was part of an effort to align existing products and systems with new performance standards without causing significant disruption for entities already invested in older packaging systems.

The other years provided in the options either precede key regulatory decisions or do not align with the timeline of changes in packaging standards related to government-owned goods. Understanding this facet of the regulatory timeline is important for grasping the evolution of packaging standards within governmental and international contexts.