The world bank forecast data cited seems to be from a 2015...

The world bank forecast data cited seems to be from a 2015 document.

In April, the World Bank had this to say about Zinc:

Zinc prices rose more than 4 percent in 2021Q1,
following double-digit increases in the previous
two quarters. The price increase has been
supported by robust Chinese infrastructure
demand, rebounding global auto output, and
surging demand for consumer durables (zinc is
used to galvanize steel). On the supply side, zinc
mines have been hit hard by COVID-19 related
disruptions, especially in South America. Seasonal
suspensions of several mines in Northern China
impacted supplies, as did a temporary halt to
operations in South Africa due to a mine accident,
that have added to a tight concentrate market.
China's future mine and smelter growth is at risk
from safety and environmental protections. Zinc
prices are forecast to increase 19 percent in 2021,
before falling 11 percent in 2022 as production
picks up and Chinese demand tapers as stimulus
measures are scaled back.
These forecasts represent substantial upward
revisions relative to October’s outlook. There are
still upside risks in the near term, which include
the proposed $2 trillion infrastructure spending
bill in the U.S. and the global energy transition
towards green growth, which will support prices
across the metals complex, particularly aluminum,
copper, and nickel. The main downside risks are
renewed COVID-19 outbreaks, compounded by
emergence of new variants or vaccine hesitancy,
and a faster-than-expected moderation of Chinese
stimulus and credit.

Commodity Markets Outlook: Causes and Consequences. April 2021. (worldbank.org)

The IISA forecast also seems to be from 2019, pre-pandemic. Knoema.com seems to be the only site presenting these figures as still relevant in 2021.

If anyone finds up to date source data consistent with what's published at the knoema.com link, I'd appreciate it.