Based on the provided data, the child immunization coverage against BCG in Vietnam has shown minor fluctuations in the past decade, generally staying within the range of 95% to 97%. As of 2023, the coverage stood at 96%, a consistency that holds true through the forecasted years up until 2028. This stability is reflected in the year-on-year variations, which have hovered around minimal changes, both positive and negative. Specifically, the last two years (2022 and 2023) showed no variation at all, staying at a steady 96%. The compound annual growth rate (CAGR) over the last five years also stands at 0%, indicating no average annual increase or decrease over this period.

Future trends to watch for:

Government policy changes or new public health initiatives that may impact immunization efforts.
Potential impacts of global health trends or pandemics which could either disrupt or improve immunization coverage.
Technological advancements in vaccine delivery or new vaccine formulations that could influence immunization rates.