Hi @leszi,
Welcome to the RStudio Community Forum.
Please do read the posting guide for this forum as it tells you about making a Reproducible Example (reprex). Posting a reprex illustrating your R problem will greatly increase your chances of getting help:
https://forum.posit.co/t/welcome-to-the-rstudio-community/8
Here is a simple example of making a barchart with {lattice}, changing the default orientation, and (one way) of forcing the x-axis tick labels to be the "years" you want.
library(lattice)
my_df <- data.frame(year=c(1998:2009),
sales=c(12,13,15,13,10,8,11,13,19,25,11,14))
my_df
#> year sales
#> 1 1998 12
#> 2 1999 13
#> 3 2000 15
#> 4 2001 13
#> 5 2002 10
#> 6 2003 8
#> 7 2004 11
#> 8 2005 13
#> 9 2006 19
#> 10 2007 25
#> 11 2008 11
#> 12 2009 14
barchart(sales~year, data=my_df)
barchart(sales~year, data=my_df, horizontal=FALSE)
barchart(sales~as.character(year), data=my_df, horizontal=FALSE)
Created on 2020-12-03 by the reprex package (v0.3.0)
HTH