| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| number of vaccines now vs 1980 | 1 | 0.2 | 1263 | 60 |
| vaccines in 1985 vs now | 0.27 | 1 | 3584 | 33 |
| number of vaccines then and now | 0.62 | 0.9 | 8133 | 80 |
| vaccine schedule 1980 vs 2020 | 0.69 | 1 | 1616 | 5 |
| number of vaccine in 1986 to 2007 | 0.81 | 0.2 | 1326 | 7 |
| vaccines over the years | 1.35 | 0.1 | 7056 | 22 |
| vaccination schedule in 1980 | 1.61 | 0.2 | 7642 | 41 |
| how many got the vaccine | 1.65 | 0.5 | 2194 | 30 |
| what vaccines were given in the 1980's | 1.59 | 0.4 | 3576 | 98 |
| what was the vaccine schedule in 1980 | 0.84 | 0.1 | 4078 | 97 |
| how many vaccines were required in 1970 | 1.31 | 0.3 | 579 | 98 |
| childhood vaccine schedule in 1980 | 1.45 | 1 | 7428 | 66 |
| how many got vaccinated | 1.81 | 0.9 | 5292 | 1 |
| previous research about vaccines | 1.07 | 0.8 | 409 | 32 |
| vaccinations over the years | 0.25 | 0.9 | 7943 | 67 |
| how have vaccines changed over the years | 1.26 | 0.5 | 1370 | 98 |
| how many americans got the vaccine | 0.27 | 0.8 | 7229 | 71 |
| how many people got the vaccine | 1.35 | 0.5 | 9101 | 13 |
| percentage of people who got the vaccine | 0.97 | 0.8 | 7762 | 83 |
| when did vaccines become common | 0.38 | 0.6 | 3785 | 36 |
| how many vaccines are there today | 0.65 | 0.3 | 8639 | 10 |
